Southampton Football Club has awarded CleanEvent Services a three-year cleaning deal at St Mary's Stadium.
The contract, which was awarded following a successful one-year deal covering football matches and other stadium activities, including concerts and events, could be extended for two more years.
It encompasses a wide range of cleaning and support services at the stadium.
CleanEvent Services is closely involved in Sustainable Saints, the club's green initiative, which includes waste recycling, phasing out single-use plastics and the introduction of reusable cups.
Tomas Gronager, CEO of CleanEvent Services, said: "Maintaining the stadium facilities in the cleanest condition helps to ensure the best experience for fans and visitors. We are delighted to be supporting Southampton FC's programme to become a leading sustainable football club, reducing impact on the environment."